Electric switch



R.Z.FARII IER.

ELECTRIC SWITCH.

APPLICATION FILED MAR. I7, 1920.

Patented Mar. 15, 1921 INS ULHTION l/Ys ULflT/ON I/ HRSULHT/ON NOFRIS PETERS. INC" LITHOL. WASHINGTON. D C

UNITED STATES BRAKE COMPANY,

PATENT OFFMJE.

TO AUTOMATIC ELECTRIC OREGON.

ELECTRIC SWITCH.

1.371,? 73. Specification of Letters Patent.

Application filed March 17, 1920. To all 2072-0111 it may concern: T'

a it known that l, Ptonnirr Z. FARMER, n of the United States. residing at )urg, in the county of Douglas and ate of Oregon,

t have invented certain he and useful Improvements in Electric Switches. of which the following is a spec fication, reference being" had to the accompanying' drawings.

This invention relates to certain improvements in electric switches and has relation more particularly to a device of this general character of a reversing type, and it is an object of the invention to provide a novel 1 and improved switch of this character wherein the same is under control of two independently operable members. preferably push buttons.

Another object of the invention is to provide a novel and improved switch of this character adapted to be interposed in the circuit for controlling the motor in the form of brake disclosed in either one of the pending applications, Serial No. 324:,350 or Serial N 336,76fl, and which switch embodies means whereby the circuit may be readily reversed in accordance with the requirements of practice.

The invention consists in the details of construction and in the combination and arrangement of the several parts of my improved switch whereby certain important advantages are attained and the device rendered simpler, less expensive and otherwise more convenient and advantageous for use, as will be hereinafter more fully set forth.

The novel features of my invention will hereinafter be definitely claimed.

In order that my invention may be the better understood, I will now proceed to describe the same with reference to the accompanying drawings, wherein:

Figure 1 is a vertical sectional view taken through a switch constructed in accordance with an'embodiment of my invention, certain of the parts being in elevation;

Fig. 2 is a view in rear elevation of the structure as shown in Fig. 1 with the plate removed;

a Fig. 3 is a view in front elevation of the structure as herein embodied with the outer or face wall omitted;

Fig. i is a view partly in top plan and partly in longitudinal section of the struc ture as herein embodied; and

Patented Mar. 15, 1921. Serial No. 368,614. I V

r 1g. 5 is a diagrammatic view illustratingthe electrical connection between certain of the contacts.

is disclosed in the accompanying drawings, denotes a main plate, preferably formed of insulating material and to an end portion of which is secured a housing H, the walls of which being also preferably iorined of insulating material. The outer or face wall 1 of the housing H has slidably disposed therethrough the push buttons B, each of which being capable of operation one in dependently of the other.

Anchored by the screws 2 or the like within the housing H and preferably to the rear wall 3 thereof afforded by an end portion of the plate P is a plate 4: of insulating material and preferably oblong in form. The outer face of the plate 4, at substantially its longitudinal center, is provided with a transversely disposed outstanding block 5. Secured to the opposite end portions of the block 5, substantially midway the lengths thereof, are the elongated strips 6 of metal or other suitable conductive material and possessing a certain degree of inherent resiliency. The opposite end portions of the strips 6 extend beyond the opposite sides of the block 5 and adjacent extended portions of the strips 6 are tied or connected by the plate 7 of insulating material and whereby said extended portions of the strips 6 are adapted to move in unison. Each of the plates 7 is positioned for contact by a button U when said button is pressed or moved in wardly. Upon release of the pressure upon the button. B, the inherent resiliency possessed by the extended portions of the strips 6 will cause said strips to move outwardly and at the same time impart similar movement to the button B.

The central portions of the strips 6 are secured to the block 5 by the binding posts 8 which also secure the block 5 to the plate 4;. The posts 8 extend beyond the inner or rear face of the plate a and have engaged therewith the nuts 9 whereby the conductors a and b may be operatively engaged with the posts 8. One of the conductors, as a, constitutes a line wire and the second conductor, as 7), constitutes a field wire.

isposed through each end portion of the plate 4 is a transversely spaced pair of posts 10 provided with the heads 11 coacting with the forward or outer face ofthe plate 4: and which heads operate to clamp to the plate a-the contact members 12. The posts 10 extend inwardly of the plate 4 and have engaged therewith the clamping nuts 1 1. Held to the posts 10 atone end of the plate a by the coacting nuts 1% are the conductors c constituting the armature wires, said nuts also maintaining in electrical connection with said posts 10 the cross wires or conductors 15 which are also held in electrical connection with the second pair of posts 10 at the opposite end of the plate 4: by the nuts 14 coactingtherewith. The inner or rear face of the plate 4; is provided with the grooves or channels 16 in which the wires or conductors 15 are substantially housed.

An end wall17 of the housing H is provided with a plurality of openings 18 through each 'of which passes-one of the conductors a, bor 0.

Each of the contact members 12 comprises a substantially U-shape metallic member having one arm 12 free and with which the adjacent end portion of a strip 6 is adapted to engage when forced inwardly by the coacting button B.

by imposing pressure or forcing inwardly one of the buttons B, a circuit is closed through the conductors a, 5 and c and upon pressing or forcing inwardly the second button B, the circuit is closed through the conductors a, I), the cross wires 15 and the conductors 0 whereby the How of the electric current is reversed.

ifr'om the foregoing description, it is thought to be obvious that a switch constructed in accordance with my invention is particularly well adapted for use by reason of the convenience and facility with which it may be assembled and operated, and it will also be obvious that my invention is susceptible of some change and modification without departing from the principles and spirit thereof, and for this reason I do not wish to be understood asliiniting myself to the precise arrangement and formation of the several. parts herein shown in carrying out my invention in practice except as hereinafter claimed.

1 claim:

1.; A switch of the character described comprising a plate of insulating material,.

an outstanding block carried by said. plate, a pair of resilient strips of conductive material secured to the block and extending beyond opposite sides of the block, one of said strips being adapted for connection witha line wire and the second of said strips being adapted for connection with a field wire, a pair of contact members carried by the plate, each of said contact members being adapted for connection with an armature wire, similar end portions of the strips coacting with said contact members, a sec-.

beyond opposite sides of the block, one of said strips being adapted for connection with a line wire and the second of said strips being adapted for connection with a field wire, a pair of contact members carried by the plate, each of said contact members being adapted for connection withan rmature wire, similar end portions of the strips coasting with said contact members, a second pair of contact members carried by the plate and coacting with the opposite end porticns of the strips, cross wires connecting the first named contact members and thesecond named contact nembers, means for 'mfi-Yll'lg adprcent endportions of the strips into engagement with the ccacting contact lGIflllES-L, said means including a plate of insulating material connecting the opposite end portions of the strips, and a button en- 5 u this with each of the plates for moving the strips into engagement with the coacting contactmembers.

A switch of the character described comprising a plate of insulatingmaterial, an outstanding biock carried by said plate, a pair of resilient strips of conductive materia'i secured to the block and extending bevond opposite sides ofthe blocln one of in strigs being adapted for connection 1 th a linc wire and thesecond of said strips being adapted for connection with a field wirr, a pair of contact members carried by the plate, each of said contact members be ing a-tiapted for connection with an armature wire similar end portions of the strips c-fmci lng' i ith said contact members, a second pair of contact members carried by the plate'and enacting with the opposite endv portions of the strips, cross wires connectin' the first named contact members and the sen id amen contact members, and means for moving adjacent end portions of the strips into engagement with the coacting contact member, each of thecontact members being substantially U-shape in form with one side arm free and with which an end portion of a strip engages.

in testimony wher of I hereunto aiiiX my signature,

nonnnr z. FARM B, 

